Diaphragm pump



FIG. 1 is a perspective view of a diaphragm pump showing our new design;

FIG. 2 is a second perspective view thereof;

FIG. 3 is a third perspective view thereof;

FIG. 4 is a fourth perspective view thereof;

FIG. 5 is a front view thereof;

FIG. 6 is a rear view thereof;

FIG. 7 is a top view thereof;

FIG. 8 is a bottom view thereof;

FIG. 9 is a right side view thereof; and,

FIG. 10 is a left side view thereof.

The portions of the diaphragm pump shown in broken lines form no part of the claimed design. 

CLAIM The ornamental design for a diaphragm pump, as shown and described. 